Numerical studies on the degeneration of internal waves induced by an initial tilted pycnocline

IOCAS-IR

	Numerical studies on the degeneration of internal waves induced by an initial tilted pycnocline
	LIN Zhenhua ; SONG Jinbao
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2014-07-15
出版年	2014
卷号	v.33 期号:07 页码:29-41
文献类型	CNKI期刊论文
摘要	The pycnocline in a closed domain is tilted by external wind forcing and tends to restore to a level position when the wind falls. An internal seiche oscillation exhibits if the forcing is weak, otherwise internal surge and internal solitary waves emerge, which serve as a link to cascade energy to small-scale processes. A two-dimensional non-hydrostatic code with a turbulence closure model is constructed to extend previous laboratory studies. The model could reproduce all the key phenomena observed in the corresponding laboratory experiments. The model results further serve as a comprehensive and reliable data set for an in-depth understanding of the related dynamical process. The comparative analyses indicate that nonlinear term favors the generation of internal surge and subsequent internal solitary waves, and the linear model predicts the general trend reasonably well. The vertical boundary can approximately reflect all the incoming waves, while the slope boundary serves as an area for small-scale internal wave breaking and energy dissipation. The temporal evolutions of domain integrated kinetic and potential energy are also analyzed, and the results indicate that about 20% of the initial available potential energy is lost during the first internal wave breaking process. Some numerical tactics such as grid topology and model initialization are also briefly discussed.
关键词	internal wave,numerical model,wave breaking,energy dissipation
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;
CNKI专题名称	海洋学;
分类号	P731.2
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	The Fund for Creative Research Groups by the National Natural Science Foundation of China under contract No.41121064 ; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11010104 ; the Open Fund of State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences under contract No.LTO1104
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190384
专题	中国科学院海洋研究所
作者单位	1.InstituteofOceanology,ChineseAcademyofSciences 2.KeyLaboratoryofOceanCirculationandWaves(KLOCAW),ChineseAcademyofSciences
推荐引用方式 GB/T 7714	LIN Zhenhua,SONG Jinbao. Numerical studies on the degeneration of internal waves induced by an initial tilted pycnocline. 2014.